BestHttp post Header

To set headers for a POST request using the Best HTTP library in C#, you can use the `HttpRequest` class. Here's an example of how to add headers to a POST request:

using BestHTTP;
using BestHTTP.Forms;
using UnityEngine;

public class HttpPostWithHeadersExample : MonoBehaviour
{
    void Start()
    {
        // Create a new form
        var form = new HTTPForm();

        // Add form fields if needed
        form.AddField("key1", "value1");
        form.AddField("key2", "value2");

        // Create a new request
        var request = new HTTPRequest(new System.Uri("http://example.com"), HTTPMethods.Post, OnRequestFinished);

        // Add headers to the request
        request.SetHeader("Content-Type", "application/x-www-form-urlencoded");
        request.SetHeader("Authorization", "Bearer YOUR_TOKEN");

        // Assign the form data to the request
        request.RawData = form.ToByteArray();

        // Send the request
        request.Send();
    }

    void OnRequestFinished(HTTPRequest request, HTTPResponse response)
    {
        if (response.IsSuccess)
        {
            Debug.Log("Request successful!");
            Debug.Log("Response: " + response.DataAsText);
        }
        else
        {
            Debug.LogError("Request failed!");
            Debug.LogError("Error: " + response.Message);
        }
    }
}

In this example, we create a new `HTTPRequest` and set the method to `Post` as the second parameter. We then add headers using the `SetHeader` method. Finally, we assign the form data (if any) to the request using `request.RawData` and send the request with `request.Send()`. The response is handled in the `OnRequestFinished` callback function.

Replace `http://example.com` with your actual URL, and modify the headers and form fields according to your requirements.